Search Results - "Martinez Valderrama, Jaime"

Landscape changes of desertification in arid areas: the case of south-west Algeria by Hirche, Aziz, Salamani, Mostefa, Abdellaoui, Abdelkader, Benhouhou, Salima, Valderrama, Jaime Martínez

“…This study aims to monitor the arid Algerian High Plateaus, a key region for pastoral activities which has suffered harsh and widespread degradation from the…”
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Assessing desertification risk using system stability condition analysis by Ibáñez, Javier, Valderrama, Jaime Martínez, Puigdefábregas, Juan

“…This paper describes a procedure for evaluating the desertification risk in threatened areas. The procedure is based on an eight-equation dynamic model of a…”
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Land Degradation States and Trends in the Northwestern Maghreb Drylands, 1998–2008 by del Barrio, Gabriel, Sanjuan, Maria, Hirche, Azziz, Yassin, Mohamed, Ruiz, Alberto, Ouessar, Mohamed, Martinez Valderrama, Jaime, Essifi, Bouajila, Puigdefabregas, Juan

“…States of ecological maturity and temporal trends of drylands in Morocco, Algeria and Tunisia north of 28°N are reported for 1998–2008. The input data were…”
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The use of a hydrological-economic model to assess sustainability in groundwater-dependent agriculture in drylands by Valderrama, Jaime Martínez, Ibáñez, Javier, Alcalá, Francisco J., Dominguez, Alfonso, Yassin, Mohammed, Puigdefábregas, Juan

“…► Assessing sustainability in the use of groundwater by agriculture in arid lands. ► Dynamic model linking hydrogeology and economy. ► Assessment procedure…”
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A dataset with complete geographic distributions of eight zonal monospecific forest types in mainland Spain by Sánchez de Dios, Rut, Sanjuán, Maria E., Sainz, Helios, Ruiz, Alberto, Valderrama, Jaime Martínez, del Barrio, Gabriel

“…Distribution area and surface are both parameters of paramount importance for habitat management, monitoring and conservation. Here we present the distribution…”
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Mask R-CNN and OBIA Fusion Improves the Segmentation of Scattered Vegetation in Very High-Resolution Optical Sensors by Guirado, Emilio, Blanco-Sacristán, Javier, Rodríguez-Caballero, Emilio, Tabik, Siham, Alcaraz-Segura, Domingo, Martínez-Valderrama, Jaime, Cabello, Javier

“…Vegetation generally appears scattered in drylands. Its structure, composition and spatial patterns are key controls of biotic interactions, water, and…”
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Land use intensification affects the relative importance of climate variation and active land degradation: Convergence of six regions around the world by Sanjuán, María E., Martínez‐Valderrama, Jaime, Ruiz, Alberto, del Barrio, Gabriel

“…We explored the relative importance of climate oscillations and human‐driven disturbances on the change in vegetation biomass in agroecosystems, and whether it…”
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Introduction: Drylands. Opportunities, challenges, and threats by Jaime Martinez-Valderrama, Emilio Guirado, Fernando T. Maestre

“…Hyper-arid, arid, semi-arid and dry-sub-humid climate zones (all of them considered drylands) occupy over 40 % of the Earth’s land surface and are home to more…”
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Implementing climate change projections in System Dynamics models by Martínez-Valderrama, Jaime, Ibáñez, Javier

“…Desertification is the degradation of drylands, which occupy an increasing proportion of the Earth's surface due to global warming. It is currently the most…”
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System Dynamics Tools to Study Mediterranean Rangeland’s Sustainability by Martínez-Valderrama, Jaime, Ibáñez Puerta, Javier

“…Rangelands are a key resource present all over the world and cover half of all emerged lands. They are even more important in drylands, where they cover 48% of…”
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Desertification in Spain: A Sound Diagnosis without Solutions and New Scenarios by Martínez-Valderrama, Jaime, del Barrio, Gabriel, Sanjuán, María E., Guirado, Emilio, Maestre, Fernando T.

“…The latest world atlas of desertification represents a turning point in the diagnosis of desertification. While it forgoes desertification mapping due to the…”
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The Importance of Prevention in Tackling Desertification: An Approach to Anticipate Risks of Degradation in Coastal Aquifers by Ibáñez, Javier, Gartzia, Rolando, Alcalá, Francisco Javier, Martínez-Valderrama, Jaime

“…Groundwater degradation is a major issue on an increasingly hot and thirsty planet. The problem is critical in drylands, where recharge rates are low and…”
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Unraveling Misunderstandings about Desertification: The Paradoxical Case of the Tabernas-Sorbas Basin in Southeast Spain by Martínez-Valderrama, Jaime, Guirado, Emilio, Maestre, Fernando

“…From its origins, the concept of desertification has been controversial. The prevailing confusion between two desertification visions, one that considers it as…”
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Applications of non-intrusive methods to study the sand cat: a field study in the Sahara Desert by Gil-Sánchez, Jose María, Herrera-Sánchez, F. Javier, Rodríguez-Siles, Javier, Díaz-Portero, Miguel Ángel, Arredondo, Ángel, Sáez, Juan Manuel, Álvarez, Begoña, Cancio, Inmaculada, de Lucas, Jesús, McCain, Emil, Pérez, Joaquín, Valenzuela, Gerardo, Valderrama, Jaime Martínez, Sánchez-Cerdá, Mariola, Lahlafi, Thomas, Martín, Jose Manuel, Burgos, Tamara, Jiménez, José, Qninba, Abdeljebbar, Virgós, Emilio

“…Surveys based on indirect signs and camera trapping are two non-invasive methods extensively used for monitoring elusive mammals. Both approaches can be useful…”
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Mediterranean Landscape Re-Greening at the Expense of South American Agricultural Expansion by Martínez-Valderrama, Jaime, Sanjuán, María E., del Barrio, Gabriel, Guirado, Emilio, Ruiz, Alberto, Maestre, Fernando T.

“…The stabling of livestock farming implies changes in both local ecosystems (regeneration of forest stands via reduced grazing) and those located thousands of…”
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La vida adaptada a la precariedad: Ecología de las zonas áridas by Jaime Martinez-Valderrama, Emilio Guirado, Fernando T. Maestre

“…Las zonas áridas de la Tierra ocupan aproximadamente el 40 % de la superficie terrestre. Su peculiar régimen hidrológico, que sitúa al agua como el principal…”
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Feeding Specialization of Honey Badgers in the Sahara Desert: A Trial of Life in a Hard Environment by Gil-Sánchez, Jose María, Herrera-Sánchez, F. Javier, Rodríguez-Siles, Javier, Sáez, Juan Manuel, Díaz-Portero, Miguel Ángel, Arredondo, Ángel, Álvarez, Begoña, Cancio, Inmaculada, de Lucas, Jesús, Castillo, Salvador, McCain, Emil, Pérez, Joaquín, Valenzuela, Gerardo, Martínez Valderrama, Jaime, Bautista, Jesús, Sarabia, Carlos, Leonard, Jennifer, Sánchez-Cerdá, Mariola, Virgós, Emilio, Qninba, Abdeljebbar

“…The honey badger (Mellivora capensis) is a medium-sized carnivore distributed throughout Africa to the Arabian Peninsula, Iran, Turkmenistan, and India…”
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Comparing Land Degradation and Regeneration Trends in China Drylands by Gabriel Del Barrio, Gao, Zhihai, Martinez-Valderrama, Jaime, Li, Xiaosong, Sanjuan, Maria E, Sun, Bin, Ruiz, Alberto, Wang, Bengyu, Puigdefabregas, Juan

“…The aim of this paper is to offer a statistically sound method to make a precise account of the speed of land degradation and regeneration processes. Most…”
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Feeding Ecology of the Cuvier's Gazelle ( Gazella cuvieri , Ogilby, 1841) in the Sahara Desert by Herrera-Sánchez, F Javier, López, Omar, Rodríguez-Siles, Javier, Díaz-Portero, Miguel Ángel, Arredondo, Ángel, Sáez, Juan Manuel, Álvarez, Begoña, Cancio, Inmaculada, de Lucas, Jesús, Pérez, Joaquín, Valenzuela, Gerardo, Martínez-Valderrama, Jaime, Sánchez-Cerdá, Mariola, Qninba, Abdeljebbar, Virgós, Emilio, Calleja, Juan Antonio, Bartolomé, Jordi, Albanell, Elena, Serrano, Emmanuel, Abáigar, Teresa, Gil-Sánchez, Jose María

“…Knowledge of the feeding ecology of ungulates in arid biomes offers an interesting model for understanding the drought resistance of large desert-adapted…”
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Assessing overexploitation in Mediterranean aquifers using system stability condition analysis by Ibáñez, Javier, Valderrama, Jaime Martínez, Puigdefábregas, Juan

“…This paper analyses competitive groundwater exploitation for irrigation by means of a special case of a dynamic predator–prey or human-resource theoretical…”
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